Energy threshold for the creation of nanodots on SrTiO3 by swift heavy ions

Details Energy threshold for the creation of nanodots on SrTiO3 by swift heavy ions Energy threshold for the creation of nanodots on SrTiO3 by swift heavy ions

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12d3009k&link_type=abstract

New Journal of Physics, Volume 12, Issue 4, pp. 043009 (2010).

Physics

3

Scientific paper

We present experimental and theoretical data on the threshold behaviour of nanodot creation with swift heavy ions. A model calculation based on a two-temperature model that takes into account the spatially resolved electron density gives a threshold of 12 keV nm-1 below which the energy density at the end of the track is no longer high enough to melt the material. In the corresponding experiments, we irradiated SrTiO3 surfaces under grazing incidence with swift heavy ions. The resulting chains of nanodots were analysed by atomic force microscopy (AFM). In addition, some samples of SrTiO3 irradiated under normal incidence were analysed by transmission electron microscopy (TEM). Both experiments showed two thresholds, which were connected with the appearance of tracks and the creation of fully developed tracks. The threshold values were similar for surface and bulk tracks, suggesting that the same processes occur at both glancing and normal incidence.

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